what is a fastener? a device to locate or hold parts
TRANSCRIPT
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What is a fastener?
• A device to locate or hold parts
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How do you remove a stuck fastener?
• PLS WD-40 Penetrating Oil
• Apply to threads and shock or vibrate the fastener to encourage the oil to penetrate
• Allow time for oil to work into threads
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How do you remove a stuck fastener?
• Use a six point wrench or socket
• Try to tighten slightly, then loosen
• An impact can help shock the fastener loose
• A strong impact will often break off the bolt
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How do you remove a stuck fastener?
• Heat can help loosen a fastener
• Too much heat can damage the fastener
• Too much heat can weaken the surrounding metal
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When do you use a new fastener?
• Damaged in any way
• Corroded
• Stretched
• Torque to yield bolt
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What is a torque to Yield Bolt?
• Most commonly used for head bolts
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What replacement fastener should you use?
• Same Length
• Same Diameter
• Same Thread Pitch
• Same Plating or Material
• Same hardness or GRADE
• Same weight
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Bolt Length and Diameter
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What replacement fastener should you use?
• Same Length
• Same Diameter
• Same Thread Pitch
• Same Plating or Material
• Same hardness or GRADE
• Same weight
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What replacement fastener should you use?
• Same Length
• Same Diameter
• Same Thread Pitch
• Same Plating or Material
• Same hardness or GRADE
• Same weight
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When do fasteners have to be the same weight?
• Any time the nut or bolt is on a rotating part
• Cooling fans
• Drive pulleys
• Flywheel or clutch or torque converter
• Lug nuts Drive shafts
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How do fasteners lock in place?
• Proper torque• Lock washers• Cotter pins• Locking tabs• Self locking nuts• Thread locking compounds
– Red LocTite© Blue LocTite©
USE the BLUE unless specified. Red will not come off!
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Do not re-use
• Nylon locking nuts
• Cotter pins
• Nuts in critical locations such as connecting rod nuts
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What do you put on the threads?
• Anti-seize compound
• Lubrication
• Lock-tight
• Red? Blue?
• BLUE
• All the above require clean threads
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How can you clean, repair threads?
• Thread chasers
• Tap
• Die
• Thread file
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Tap
• Cuts internal threads in a hole or nut
• Extremely brittle
• Work back and forth using a tap handle
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Die
• Cuts external threads on a rod or bolt
• Will easily cross thread and ruin a bolt
• Thread file can help straighten damaged threads on a bolt
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What is torque?
• Torque is a twisting force
• Torque is used to make sure the bolt has the proper clamping force
• Too much force weakens the bolt
• Too little force allows parts to work loose
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What is torque?
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Ft Lbs vs Inch Lbs
• 12 inch lbs = 1 ft lbs
• 120 inch lbs – 10 ft lbs
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How to insure clamping force is correct
#1 Look up specific torque value #2 Insure fasteners are the proper grade, length & finish #3 Clean all thread surfaces #4 Use the proper washer and only if specified #5 Install proper length bolt in hole. #6 Run bolts through to feel for rough or tight threads #7 Lubricate bolts consistently #8 Use a torque wrench that is appropriate
(not on the end of the scale)
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Beam Type (Deflecting Beam)
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Dial type Dial Indicator
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run back to lowest setting between uses
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Calibration of Torque Wrench
• Do not use to break loose bolts
• Do torque past capacity of wrench
• Unscrew micrometer (click type) to lowest setting between uses
• Have calibration checked periodically
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What is torque to yield?
• Tighten to a specific torque
• Continue to turn the fastener just enough to cause it to begin to stretch
• Typically specified in degrees of rotation
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Be careful when using extensions indicated to true torque value when using an extension wrench.
D = (A x T) ÷ (A + B) D = indicated Dial reading on torque wrench A = Length of torque wrench B = length of extension T = torque specified by manufacturer
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